--  @testpoint:opengauss关键字cascade(非保留)，作为函数名
--关键字不带引号-成功
drop function if exists cascade;
create function cascade(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--清理环境
drop function cascade;

--关键字带双引号-成功
drop function if exists "cascade";
create function "cascade"(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--清理环境
drop function "cascade";

--关键字带单引号-合理报错
drop function if exists 'cascade';
create function 'cascade'(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/

--关键字带反引号-合理报错
drop function if exists `cascade`;
create function `cascade`(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/